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if you are replacing the valve to fix code p0104 [insuficient flow] than the cause was most likely the carbon build up. to test this simply run the car at idle. than use a vaccum pump to actuate the egr valve. the engine should instantly stall. if not than your valve or ports are clogged. if it does stall than you want to test the egr solenoid. to do this simply apply vaccum to the solenoid. make sure the solenoid holds this vacuum. than apply 12volts. the solenoid should bleed off the vacuum
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